You'll have 1,2,3 and D. 1 restricts it to the equivalent of 1st gear, 2 restricts it to 1st and second, 3 restricts it to 1st, 2nd and 3rd and D gives it access to all the forward gears.
You'd use the "numbers" when you want to keep the gears low, for instance for engine braking on a steep hill or when you want to prevent it changing up any further perhaps for best acceleration and control. Putting it in D allows the transmission to make its own mind up.
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